More than 3,000 of the world's most pampered dogs have descended upon Manhattan as the Westminster Kennel Club returns to New York City for its 139th annual all-breed dog show at Madison Square Garden on Monday and Tuesday. Dogs from 192 different breeds and varieties will compete for the Best in Show prize. The honorable David Merriam, a former California state trial judge and bull-terrier breeder, will serve as Westminster's Best in Show judge for the first time, heading a panel of 33 officials that includes four previous Best in Show judges.